This nBAB was the

`st BAB for the the Spring 2009 session.`

231`set a new record for most BABs posted during a session breaking the previous record 230 BABs set during the Fall 2008 session.`

231MathBabbler Number Analyst (MBNA) output: ========================================= 231 is a natural, whole, integer 231 is odd 231 proper divisors are: 1,3,7,11,21,33,77, 231 is deficient (sum of divisors is 153) 231 is unhappy 231 is not a Harshad number 231 is not prime 231 has the prime factors: 3*7*11 (sum=21) 231 is sphenic (had 3 unique prime factors) 231 sum of prime factors is: 21 231 in octal is 0347 231 in hexadecimal is 0xe7 231 in binary is 11100111 (is evil) 231 nearest square numbers: -6...25 (225 [15]...256 [16]) sqrt(231) = 15.1987 ln(231) = 5.44242 log(231) = 2.36361 231 reciprocal is .00432900432900432900432900432900 231! is 1.79223e+447 231 is 73.5296 Pi years 231 is 11 score and 11 years 231 written as a Roman numeral is CCXXXI

`is one U.S. liquid gallon. [Wikipedia.org]`

231

`is a Lucky number. [NumberGossip.com]`

231

`is a square free number. [NumberGossip.com]`

231

**Creator:** Gerald Thurman
[gthurman@gmail.com]

**Created:** 27 April 2009

This work is licensed under a Creative Commons Attribution 3.0 United States License.